Arm of a dental unit



FIG. 1 is a perspective view of a dental unit arm;

FIG. 2 is a front plan view thereof;

FIG. 3 is a first side plan view thereof;

FIG. 4 is a rear plan view thereof;

FIG. 5 is the other side plan view thereof;

FIG. 6 is a top end view thereof; and,

FIG. 7 is a bottom end view thereof. 

CLAIM The ornamental design for an arm of a dental unit, as shown and described. 